Gmelin, Johann Georg (1709-1755) . German. Voyager, botanist and chemist. At the initiative of empress Anna of Russia he spent ten years (1733-1743) exploring Siberia. In 1749 he became professor of botany and chemistry at Tübingen. Together with his nephew Samuel Gottlieb he wrote Flora Sibirica (1747-1769). Correspondent of Linnaeus.